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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c02c18138faa93d36bbff099aa9402f08d87d1058140a078fbb855fdd2aa8bed' 
  AND token = 'ZtQHFJ7crCn/+M9BeuwM1mLcxCGaL07eo4lzxUyTUpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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