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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27c51fcf6bdccf776b3628f1cc4dd80b9bed3dec46a76ad4121006e29a3ca0e8' 
  AND token = 'I6SzZDnued1Il68WMYDzfyQlAyQYvLLca/TNyaV+foM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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