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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '359e7ea4de2057f8fc84e2654102b3f4d6cc4b99714c7cd648e67f15f5a657eb' 
  AND token = 'kzffXgAcJXiOsNVaTnaJUiNf12VqwQnw17awWFg6DCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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