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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '134e07a7ae6d8664884a3059ec24ee63cc6b05411d6d3c38b38bc63af0917036' 
  AND token = 'u55aYrV4zZmW1vEQt8N4k8WnoGyN5XFMy4W76YfWHUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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