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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac4f9ecf2d7249cf565db1c874ef01d7328a23a0f4d5dbd7c72ff6a529e1eb9e' 
  AND token = 'BndpV/cdk4zR9dFN+HPtlIWJRuw4BtnANWQsoT9loOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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