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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e10083c70a2c6dfc4c0402bb3682b0115c075bff86a51aa686a37e21ba7888f0' 
  AND token = '0Y0o0o41w0zQO3v9k66xkF2h6O63j8P6+/Sy1Risuxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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