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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ddad0869f617b05112e7027802bc3349298a4c0e70458f6e4d8b665823ad37f' 
  AND token = 'QSdvD9KRZDnZLnB7zipSvG/1/nvTfKbvzmoZXFyonnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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