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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57f67a5884ffcbc2a2f6f40c1feed3189d75949d1c60933b428cff361e6009e4' 
  AND token = 'qiten0CdMyRKEKD5EnXls2DbjtUIIyTXpGVw4pcEFAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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