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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb75086b69dfbfb9f81be47cfa32eec8ffa55d7edc3058b762315f44a6cf1df1' 
  AND token = 'VqBiS4bcrx83ebsNQczH0iGWhGO/NMWNO73RaTJPToI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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