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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c6185464e2c1bfcd798d2896b6461ad246e8d7fdcd957624bda1b6360c2a312' 
  AND token = '+3A46YSUgi7EqtayCXr51NWFpUKt/FowBzobgAFVcIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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