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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb9ad6ac40eab89aa6cf9bdc5e3f24b9295ba56753a4b7a18f8ecd72b69cf482' 
  AND token = 'pQYnrCy6D38dKwSdO/AfDoJlXftoe8bSg18IVj8szSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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