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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1783895f7c56173f63677e0fca3f69a8eb58131e7f0fe1d3fcc7722c4373af0' 
  AND token = 'fwJMwLnRlUmRmtYYr6j6A7T9tY9EUhLh8ghK2wZ2PMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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