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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06835e06ae4ed695a717de2c1c15cc51ad4f55131fbacb2f6183dbcd99721088' 
  AND token = 'zSj7FCwD9VEIMiixbTeGnySDeNZ7blX2z3X6ayk0cK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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