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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '118584300c25b74e6454b35cca3c0774c38558050470088c8f6c4ccbc49488c0' 
  AND token = '2nvK5k6mt92PCaZfncH2HpeyFCNeK2lyU1hj/u24hso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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