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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7655a1415c8180e2e15e978baf4a0ca883e1245c1d2ebc5957087b98ff9375e' 
  AND token = 'Q6VL7D45JJ4cPylUIy8kmV1mQPHHToNIsqa9yGc8awc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}