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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2637665b4e3efc1654b41bb0cdacc60f8c726f6708b384bde4af4adb411816a' 
  AND token = 'qDeErK2LWXLF5QS2WAo82A3+1b0954GWwu4Npdm7UUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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