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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c381f37d39c0ab235820b89a33cec8ce6bc762506a9d6aaed303be470f91e9' 
  AND token = '1/naEgjJvIRuyVKA3AamAn0xnV4orUkjcuJUXEPD4YY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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