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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72ad7390a2c1e2667f42865f160d9ea4909f9c59dfc9d4e756ee876cf260f99a' 
  AND token = 'kI6uGNxkN4usgFN5Y8yTTemm/tI9MubOgxwbx8BLG/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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