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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d582b35dcf0a1a9e9e8d67593cbcec263b4922b7c2975fffe2373b208877e5a' 
  AND token = 'm7VBuFlPp7T/N468pwlVnAd2eLSxkte9r3cnS6D93G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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