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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cc0f5d11f25877b6c9c4b8b0088f66ec3ea8cfb22cf8110d95de0003d40ba05' 
  AND token = 'zoPYqtoe0qGEX92jsmZTTzS+SfmGlmo1+CUSsE2fXlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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