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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc9cc2f6ab82a52e98c02483bccc1acb23f4704d898d3dca810f1cd5eb83bf10' 
  AND token = 'zz83Xa8t7ZG5Sgsw7S0HMOh3U62+xlr7h2sLUEGn8zM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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