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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '956c1422f538f419019cec4a7762109d66de03db962dfa9e68e380935df2524d' 
  AND token = 'k6vaE0JxhW/f7s/7XiJ+12+PD9eEuJFuWEH2epO671A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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