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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c62344f85adfdcd63c91e12b06653fb4f9df1db9cd27507c451f84b80dba4c69' 
  AND token = 'JsOhFZIO9lE6yeN1femne2bsMEdR/G2BnjSFhzedDsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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