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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2197c547859e9658d5102c33397626b9b64b361ec52f8529d6615769b0ff3313' 
  AND token = 'og7iiIep10JN7IC5FcP2ysj/RHivuAjI0TZcVtmptMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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