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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2b42f4a3904022fa4b9746207c0b27ca85fc191d5368140e61eba730b8b86dc' 
  AND token = 'N58qCOJHGzMbui47+QokUyhmoHLIlSDRQuHb6a41/9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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