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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0fc1736ae4cde31aafdd2a18c9dc90a957f2dc93a75437a3f2ba31a8c1cb007' 
  AND token = 'WA/W5yX1EfW/snougyBdmnhAolYjIFqi+N1trgah690=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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