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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd69f030d5250c6ab4abafc37329a268753c1e6bcf6287e2c132d6d21b9e33df9' 
  AND token = 'eP/xtFDSfzl0dv70msdxzBy2VRPJ47P7tZYalSQsjaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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