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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94f7286b73eb1472df52237defebe48250de8cf183faab731ef55c9806228f99' 
  AND token = '9tuMhh1l10P9QV/11+2mWaJo50r8mWBabS2FP9zxxC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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