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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '055ca6a13c3642003065227f2a16ac5829ecb27771dba6a86345f53cb1be0fe5' 
  AND token = 'fb72d0s7Ucmf3kQ1Ah7wut2vINZPc5gKCyjRXEqtXNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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