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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72fc4c480e28f8caf2f7603bde1de6863cf6b72baafd52e55aff37b181a3b23e' 
  AND token = 'sMrlSrpUHSICYeVZ4FG7s5ZM+y5p0SUKXUtTiFgMgFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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