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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4498d0df294307554ad127c63c17bcad85d0a4854e7ee8847c5c88907d82c73' 
  AND token = 'i2Zo+rxufgnZUcB/RLfMqeCb+lyj4r0dxKkf8AUmZZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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