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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4328c960fb9a34b3c45e1474f74cb2d832640f299775fed1da718fb49bc4856' 
  AND token = 'l7E1T6F0WV8e70JvmFtjqKOcS4uH/n7FsF/9sS29scM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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