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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73fec1bcb446f6b809df9fdf367f1634d697b5bbc0de2bc19f99184bd2083d61' 
  AND token = '1AYYVUiFlq+8mcqGaPn9cuDFHOdz7bu64NSEVvof3aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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