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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44a2859e978fde105c1078507dc30231bca73c0c2bfd4ed886a7415ab2ca8eda' 
  AND token = 'NSelTFrzmx3cRq8DjDCWJRc4ypOA+OZ+XZzH1aIWc/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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