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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ca2243aeba758a7b741a502670320d78e26f431d7e4f7eede54da9947c4515d' 
  AND token = 'DS0hqmBnaIoDuBdvS39vOCx+n9JrPlRc1q1XSx+XaGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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