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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04e3b8036cfefab440e80aca2e37d9b07304e97062c0f257e655c1d5e98482dd' 
  AND token = 't2bBTfioHSAYKQYl328AUcvLz99WkAx8Sh1F7i/KbAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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