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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8137a241fd9de9466de2c580744d34c904d8cc5de4760d5c89ed313e69975514' 
  AND token = 'l3utP0zbrdfPCQPLV343vDhdwOlP/Ws7VpMP8l94RcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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