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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9742f2604a9ba383dce8cf2e6c2564f9641f1e8d0ab11e8a37cda50b90acfefc' 
  AND token = 'xhz+Xc981AEaZ6Q0tpdjytYuRAQ0gXnFP3y6dq7N6gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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