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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66bd851d6823c4d24c6cd5a6336218d1a8e6cf5da1c25c263b910e111979ef26' 
  AND token = 'a2UGEDhWqZ2dvWdDfloTBker8gm+K4O73rJsWgL0iIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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