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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e23306beabdc0cf27bb655a3cc5a6a3603b9e8675fc8730ad6a6ab800fde5632' 
  AND token = 'dcGq1kCSGs1ApYlgrbZyn1OoJ36L+wlurONv39xbQD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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