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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '670c16491cbea6cc9dfd0c6aa0591282c71f1bbc6703dae9385e94babad11b07' 
  AND token = 'gFlJ4gD8FhaTLAEMrIwbq1Ye+EIm4uzaJG//xld15m8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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