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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '142c5b44cb913953830963bba85bc5afeb6fd447feaab5f56d3f7d8359fe63da' 
  AND token = 'CoeE9amNgAO32inT0IwSY6lJ5qLhfCJU4lNHwUZf/Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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