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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4063112bedc97cd8dcd49addee3d015662a97330274d4e8a1547c2d20d2ea8ab' 
  AND token = 'L2jDp3jACleDu9YkC6EVgcLCGYKHy9aQThS3pzdS/vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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