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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f3efbbaa848568836e7ddeffe25da8b65e2f889f11dd83a868dcfef10a0c793' 
  AND token = 'T60T66TIdctFYTuZmL3rdLRaL+j3vO1ExgNgCRt/6nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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