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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a31bccba24b6aa0052a75cd3ae103ddee43362174daf1dbefb150e13a0c38994' 
  AND token = 'iL+Gwu4mfDu4l3IwWo0GSrUK/DfGrr8bXh8U66MjzNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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