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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a196baa1e436b386a63388d47ffb5057dce1ac41be859357c0f43aac15873271' 
  AND token = '6AWJSng5P5q8J3f1sPFiEBuiJM1iowlTl6M3WbuX8vQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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