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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b07d6262e4a700c7770cfceee6fc8ad392d481b14903c514aefd8492c34ef79a' 
  AND token = 'cngDrVEm5lQLCzEkyv6eBHguxvcyU5h9Gijql5Vu3zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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