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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cc3e81a4a6514290621d4bad38ce48daf4ebafcdc49c8bd27cbcb4d689fcff8' 
  AND token = 'mq7AXU+5RYp/1N2AdFe2SG8C1xI8+G718D2oFq7C2+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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