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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed212630bec608cb32b2b89487959cad021205ad98557c0c168435be768887fd' 
  AND token = 'Fq0GpL3MfGcnc7uWHisA0Q2/1yowDJ/lEl1CT8e8wlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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