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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f248fb1cb1b707399fd9b7387088aa2b8b6f54980904ae4f5fc26bf593ac0d3b' 
  AND token = 'j544rfujyOEg/QZSuOobv+joeWr4z2HM5EK4CvtspxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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