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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aab585fc7c4e9d40fb28e3266c8c9239eb4d27fb1e00903d9644926d56a8e61' 
  AND token = 'E7C6KmTgJgSaCyO7NPj36Y87w1mdSsEXG6hs2TnlHy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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